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  • ListView简单使用

    先上效果:

    clip_image002

    主要实现了Listview的绑定和点击事件。项目资源结构如下:

    clip_image003

    先创建一个动物类,用来装载数据:

    Animal类如下:

    package com.example.simplelistviewdemo;
    
    public class Animal {
        private String aName;
        private String aSpeak;
        private int aIcon;
    
        public Animal() {
        }
    
        public Animal(String aName, String aSpeak, int aIcon) {
            this.aName = aName;
            this.aSpeak = aSpeak;
            this.aIcon = aIcon;
        }
    
        public String getaName() {
            return aName;
        }
    
        public String getaSpeak() {
            return aSpeak;
        }
    
        public int getaIcon() {
            return aIcon;
        }
    
        public void setaName(String aName) {
            this.aName = aName;
        }
    
        public void setaSpeak(String aSpeak) {
            this.aSpeak = aSpeak;
        }
    
        public void setaIcon(int aIcon) {
            this.aIcon = aIcon;
        }
    }
    View Code

    AnimalAdapter类如下:

    package com.example.simplelistviewdemo;
    
    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.ImageView;
    import android.widget.TextView;
    
    import java.util.LinkedList;
    
    public class AnimalAdapter extends BaseAdapter {
    
        private LinkedList<Animal> mData;
        private Context mContext;
    
        public AnimalAdapter(LinkedList<Animal> mData, Context mContext) {
            this.mData = mData;
            this.mContext = mContext;
        }
    
        @Override
        public int getCount() {
            return mData.size();
        }
    
        @Override
        public Object getItem(int position) {
            return null;
        }
    
        @Override
        public long getItemId(int position) {
            return position;
        }
    
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            if(convertView == null){
                convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list_animal,parent,false);
                holder = new ViewHolder();
                holder.img_icon = (ImageView) convertView.findViewById(R.id.img_icon);
                holder.txt_aName = (TextView) convertView.findViewById(R.id.txt_aName);
                holder.txt_aSpeak = (TextView) convertView.findViewById(R.id.txt_aSpeak);
                convertView.setTag(holder);   //将Holder存储到convertView中
            }else{
                holder = (ViewHolder) convertView.getTag();
            }
            holder.img_icon.setBackgroundResource(mData.get(position).getaIcon());
            holder.txt_aName.setText(mData.get(position).getaName());
            holder.txt_aSpeak.setText(mData.get(position).getaSpeak());
            return convertView;
        }
    
        static class ViewHolder{
            ImageView img_icon;
            TextView txt_aName;
            TextView txt_aSpeak;
        }
    }
    View Code

    MainActivity代码如下:

    package com.example.simplelistviewdemo;
    
    import android.content.Context;
    import android.net.Uri;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.LinearLayout;
    import android.widget.ListView;
    import android.widget.Toast;
    
    
    
    import java.util.LinkedList;
    import java.util.List;
    
    public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener{
    
        private List<Animal> mData = null;
        private Context mContext;
        private AnimalAdapter mAdapter = null;
        private ListView list_animal;
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            mContext = MainActivity.this;
            list_animal = (ListView) findViewById(R.id.list_animal);
    
            //动态加载顶部View和底部View
            final LayoutInflater inflater = LayoutInflater.from(this);
            View headView = inflater.inflate(R.layout.view_header, null, false);
            View footView = inflater.inflate(R.layout.view_footer, null, false);
    
            mData = new LinkedList<Animal>();
            mData.add(new Animal("狗说", "你是狗么?", R.mipmap.ic_icon_dog));
            mData.add(new Animal("牛说", "你是牛么?", R.mipmap.ic_icon_cow));
            mData.add(new Animal("鸭说", "你是鸭么?", R.mipmap.ic_icon_duck));
            mData.add(new Animal("鱼说", "你是鱼么?", R.mipmap.ic_icon_fish));
            mData.add(new Animal("马说", "你是马么?", R.mipmap.ic_icon_horse));
            mAdapter = new AnimalAdapter((LinkedList<Animal>) mData, mContext);
    
            //添加表头和表尾需要写在setAdapter方法调用之前!!!
            list_animal.addHeaderView(headView);
            list_animal.addFooterView(footView);
    
            list_animal.setAdapter(mAdapter);
            list_animal.setOnItemClickListener(this);
        }
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(mContext, "你点击了第" + position + "项", Toast.LENGTH_SHORT).show();
        }
    }
    View Code

    主界面布局如下:

    activity_main.xml:

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context="com.example.simplelistviewdemo.MainActivity">
    
        <TextView
            android:layout_width="match_parent"
            android:layout_height="48dp"
            android:textSize="18sp"
            android:text="动物的世界你们不懂"
            android:gravity="center"
            />
        <ListView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/list_animal"
            android:layout_gravity="center_horizontal" />
    </LinearLayout>
    View Code

    item_list_animal.xml:

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">
    
        <!-- 定义一个用于显示头像的ImageView -->
        <ImageView
            android:id="@+id/img_icon"
            android:layout_width="64dp"
            android:layout_height="64dp"
            android:baselineAlignBottom="true"
            android:paddingLeft="8dp" />
    
        <!-- 定义一个竖直方向的LinearLayout,把QQ呢称与说说的文本框设置出来 -->
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
    
            <TextView
                android:id="@+id/txt_aName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:paddingLeft="8dp"
                android:textColor="#1D1D1C"
                android:textSize="20sp" />
    
            <TextView
                android:id="@+id/txt_aSpeak"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:paddingLeft="8px"
                android:textColor="#B4B4B9"
                android:textSize="14sp" />
    
        </LinearLayout>
    
    </LinearLayout>
    View Code

    附加了一个头部和一个底部:

    view_header.xml:

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="48dp"
            android:textSize="18sp"
            android:text="表头"
            android:gravity="center"
            android:background="#43BBEB"
            android:textColor="#FFFFFF"/>
    </LinearLayout>
    View Code

    view_footer.xml:

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="48dp"
            android:textSize="18sp"
            android:text="表尾"
            android:gravity="center"
            android:background="#43BBEB"
            android:textColor="#FFFFFF"/>
    </LinearLayout>
    View Code

    完整代码下载

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  • 原文地址:https://www.cnblogs.com/madyina/p/5788976.html
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